fix: Don't encode large RTT guesses in tickets #4014

Job	Run time
Build & test (ubuntu-latest, 1.76.0, debug)	13m 38s
Build & test (ubuntu-latest, stable, debug)	13m 28s
Build & test (ubuntu-latest, nightly, debug)	12m 38s
Build & test (macos-14, 1.76.0, debug)	14m 27s
Build & test (macos-14, stable, debug)	14m 21s
Build & test (macos-14, nightly, debug)	15m 47s
Build & test (windows-latest, 1.76.0, debug)	24m 0s
Build & test (windows-latest, stable, debug)	23m 50s
Build & test (windows-latest, nightly, debug)	21m 50s
Build & test (ubuntu-latest, stable, release)	18m 58s
Benchmark / Benchmark	15m 48s
	3h 8m 45s

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